Recording medium having recorded thereon coded information using plus and/or minus rounding of images

Abstract

A recording medium having recorded thereon information of images coded by performing motion compensation is provided to obtain high quality images without error accumulation. Such information includes rounding method information specifying a positive rounding method or a negative rounding method for interpolation intensity values of pixels in performing the motion compensation.

1. A decoder-readable media having recorded thereon information of images which have been coded by performing motion compensation, and rounding method information interrelated to the information of images, for specifying a positive rounding method or a negative rounding method and useable by a decoder for interpolation of intensity values of pixels in performing the motion compensation. 
   
   
     2. A decoder-readable media according to  claim 1 , wherein the rounding method information consists of one bit. 
   
   
     3. A decoder-readable media according to  claim 2 , wherein the rounding method information specifies a positive rounding method when the one bit has a first logical value, and specifies a negative rounding method when the one bit has a second logical value. 
   
   
     4. A decoder-readable media according to  claim 1 , wherein the rounding method information specifies one of two values, where one of two values specifies a positive rounding method, and the other one of two values specifies a negative rounding method. 
   
   
     5. A decoder-readable media having recorded thereon information of images which have been coded by performing motion compensation, and rounding method information interrelated to the information of images, for specifying a positive rounding method or a negative rounding method for interpolation of intensity values of pixels in performing the motion compensation, the rounding method information being useable by a decoder in rounding operations in performing a function to reproduce the images. 
   
   
     6. A decoder-readable media according to  claim 5 , wherein the rounding method information consists of one bit. 
   
   
     7. A decoder-readable media according to  claim 6 , wherein the rounding method information specifies a positive rounding method when the one bit has a first logical value, and specifies a negative rounding method when the one bit has a second logical value. 
   
   
     8. A decoder-readable media according to  claim 5 , wherein the rounding method information specifies one of two values, where one of two values specifies a positive rounding method, and the other one of two values specifies a negative rounding method. 
   
   
     9. A computer-readable recording medium having a computer-readable program recorded thereon, the program causing the computer upon implementation to record information of images which have been coded by performing motion compensation, and record rounding method information interrelated to the information of images, for specifying a positive rounding method or a negative rounding method useable by a reproducing computer for interpolation of intensity values of pixels in performing the motion compensation. 
   
   
     10. A computer-readable recording medium according to  claim 9 , wherein the rounding method information consists of one bit. 
   
   
     11. A computer-readable recording medium according to  claim 10 , wherein the rounding method information specifies a positive rounding method when the one bit has a first logical value, and specifies a negative rounding method when the one bit has a second logical value. 
   
   
     12. A computer-readable recording medium according to  claim 9 , wherein the rounding method information specifies one of two values, where one of two values specifies a positive rounding method, and the other one of two values specifies a negative rounding method.